Hey.
The cut off for admission in government colleges in Delhi  under the All India quota for the SC category in the previous year 2018 was a rank of 18654 and a score of 508 marks in BSA Medical College. The cut off for rest colleges was higher.
The cut off changes each year due to several factors like level of difficulty or level of Competition etc. This year as the paper was easier the cut off based on marks will be higher than before.
Considering your score, and the previous year last score you seem to have a fair chance of Admission here.
You can use the link below to check the previous year trends.
https://medicine.careers360.com/articles/neet-cutoff-du/amp
Best of luck.

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